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How to present on computer screen two pictures?

I was wondering how to present two pictures simultaneously in superlab 5?

My experiment is basically, presenting pictures of scenes at study and at test, pairs of scenes are presented, as in a multiple choice or 2-alternative forced-choice format.

For example:

Study phase (random presentation): Picture of House, Picture of Beach, Picture of Hotel, Picture of Waterfall, and so on

Test (random presentation): Picture of House Picture of Hotel; Picture of Beach Picture of Waterfall; and so on

I think "Presentation Options" in settings of Superlab, "keep stimulus invisible" of the picture in Superlab is to be selected. However, that does not work. In superlab, it states"Use this option to present several visual stimuli at the same time (within the same trial). To present the stimuli simultatously turn this option On for all except the last one."

In trials, I have list of study pairs, each linked to two events (picture 1 and picture 2).I want to present these two pictures at the same time or simultaenously for a length of 4 s. So for example, in Trials: Study Pair 1 is linked to Study Pic 1 and Study Pic 2.

For StudyPic 1, I have the opitions under Input tab: End this event and move to the next one. " I checked of "Immediately after the event is presented" . For stimulus options, I did not check Erase screen before presenting stimulu, Keep stimulus invisible, use offscreen buffer. At evend end, do nothing.

For Study Pic 2, I checked of only after time limit, being 4000 ms. I did not check Erase screen before presenting stimulus.